let (.()) = () and (.{}) = () and (.[]) = ()
let _ = (x.(y), x.{y}, x.[y])

let (.%%()) = () and (.!!{}) = () and (.$+[]) = ()
let _ = (x.%%(y), x.!!{y}, x.$+[y])
let _ = x.%%(y, z)

let _ = (.{})
